3EE2 Special-Purpose Surge Arresters for the Protection of Motors, Generators and Furnace Transformers Rated voltage 5.6 to 52 kV for ZnO types n Low protection level n Very high energy absorption capacity n Very high short-circuit current strength n Strong, self-supporting construction Medium-Voltage Equipment Catalog Data Sheet HG 21.2.7 October ⋅ 1998 3EE2 Special-Purpose Surge Arresters for the Protection of Motors, Generators and Furnace Transformers n Application Protection against switching impulse voltages and surges of atmospheric origin for sensitive equipment such as rotating machinery (and other types of equipment having windings in air) can be provided by special types of arrester whose key features are a low protection level and fine grading of the rated voltages. For protecting generators there are versions available with a short-circuit current strength of up to 300 kA. The arresters can be used in AC system with frequencies of between 48 and 62 Hz and either outdoors or indoors at altitudes of up to 1000 m above sea level. The governing factor for the protection against switching surges is the residual voltage from a surge current of 0.5 kA, waveform 30/60. This value of residual voltage is the level of protection to which the switching surges are limited. If the infeed is coming from overhead power lines, surge arresters (3EG or 3EK) must also be installed at the point of entry of the overhead lines into the system. This will eliminate the residual voltages that arise from higher discharge current values. n Construction Type 3EE2 surge arresters are constructed from suitable modified components taken from the type 3EP highvoltage surge arresters. The 3EE2 are of the metaloxide type with no series gap. 2 Siemens HG 21.2.7 ⋅ October 1998 n Installation The arresters are normally mounted vertically with the high-voltage connection at the top, although suspended installation can also be employed, if necessary. The latter must be stated in the order. Horizontal mounting may also be employed, if required. The 6-arrester circuit is a special case, one of whose uses is for the protection of furnace transformers. Three of the arresters are connected in star (line-to-earth) and three in delta (line-to-line). If this arrangement is going to be used it must be stated in the order. Machine-type surge arresters with a high short-circuit current strength provide protection for generators in power stations. The arresters can be supplied tested with short-circuit current strength from 50 to 300 kArms. Any additional enclosure that might be needed on the plant side is not included with the arresters. n Monitoring The surge arresters do not require any monitoring devices nor do they need any servicing or maintenance. The number of times the arresters have discharged, the magnitude of the discharge currents and the nature of the overvoltages involved can be ascertained by installing a type 3EX6040 telltale spark gap in the earthing conductor. n Technical data Nominal discharge current Isn 10 kA (peak value in kA, waveform 8/20) High-current impulse Isn 100 kA (peak value in kA, waveform 4/10) Energy absorption capacity 8 to 10 kJ/kV rated voltage Operating frequency 48 to 62 Hz, other frequencies to order Short-circuit current strength 50 to 300 kA; 0.2 s (rms value in kA) Protection values for type 3EE2. surge arresters Max. continuous Max. residual voltage at discharge current with U voltage waveform 30/60 kVrms kVrms 5,6 Rated 1) voltage U waveform 8/20 0,5 kA 1 kA 5 kA 10 kA 20 kA kV kV kV kV kV 4,5 11,5 12 13 14 16 7,5 6 15,5 16 18 19 21 9 7,2 18,5 19,5 22 23 26 12 9,6 25 26 29 31 35 44 r c 15 12 31,5 33 37 39 19 15 39,5 41 46 49 55 23 18 48 49 55 59 66 27 22 56 58 65 69 77 30 24 62 64 72 77 86 34 27 70 73 82 87 97 38 30 78 81 91 97 109 45 36 92 96 108 115 129 Protection values for type 3EE2. surge arresters (special versions for furnace transformers) Energy absorption capacity 10 kJ/kV Short-circuit current strength 50 kA: 0.2 s Rated Max. continuous voltage U voltage U 0,5 kA 1 kA 5 kA 10 kA 20 kA kVrms kVrms kV kV kV kV kV r c Max. residual voltage at discharge current with waveform 30/60 waveform 8/20 22 17,5 43 45 50 53 59 30 24 59 61 68 72 80 32 26 63 65 73 77 86 36 29 71 74 82 87 97 45 36 88 91 102 108 120 52 42 102 105 118 125 139 Arrester housing Housing 2) size Dielectric strength Impulse withstand Power-frequency Flashover Creepage voltage withstand voltage distance distance 1,2/50 Dry Wet kV kV kV mm mm 1 150 80 65 255 605 2 240 130 110 435 1095 3 220 105 90 360 640 1) 10 s voltage at which the rectangular-impulse current operating duty test can be withstood. 2) See selection and ordering data, page 4. Siemens HG 21.2.7 ⋅ October 1998 3 Selection and ordering data n Rated Short-circuit current strength Weight voltage kVrms 1) 5.6 1) 7.5 1) Hous- approx: ing 50 kA / 0.2 s 63 kA / 0.2 s 100 kA / 0.2 s 200 kA / 0.2 s Order No. Order No. Order No. Order No. 3EE2 056 3EE2 075 - 9 3EE2 090 - 12 3EE2 120 - 15 3EE2 150 - 19 3EE2 190 - 23 3EE2 230 - 27 3EE2 270 - 30 3EE2 300 - 34 3EE2 340 - 38 3EE2 380 - 45 3EE2 450 - ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ A0 3EE2 056 - A0 3EE2 075 - A0 3EE2 090 - A0 3EE2 120 - A0 3EE2 150 - A0 3EE2 190 - A0 3EE2 230 - A0 3EE2 270 - A0 3EE2 300 - A0 3EE2 340 - A0 3EE2 380 - A0 3EE2 450 - ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ B0 3EE2 056 - B0 3EE2 075 - B0 3EE2 090 - B0 3EE2 120 - B0 3EE2 150 - B0 3EE2 190 - B0 3EE2 230 - B0 3EE2 270 - B0 3EE2 300 - B0 3EE2 340 - B0 3EE2 380 - B0 3EE2 450 - ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ C0 3EE2 056 - C0 3EE2 075 - C0 3EE2 090 - C0 3EE2 120 - C0 3EE2 150 - C0 3EE2 190 - C0 3EE2 230 - C0 3EE2 270 - C0 3EE2 300 - C0 3EE2 340 - C0 3EE2 380 - C0 3EE2 450 - Short-circuit Weight Hous- current strength approx. ing 300 kA / 0.2 s size size kg ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ kg D0 25 1 D0 25 1 D0 25 1 D0 25 1 3EE2 120 - D0 30 1 3EE2 150 - D0 30 1 3EE2 190 - D0 30 1 3EE2 230 - D0 30 1 3EE2 270 - D0 40 2 3EE2 300 - D0 40 2 3EE2 340 - D0 40 2 3EE2 380 - D0 40 2 3EE2 450 - ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ ¨¨ E1 75 3 E1 75 3 E1 75 3 E1 75 3 E1 85 3 E1 85 3 E1 85 3 E1 85 3 E1 85 3 Order No. suffix Energy absorption capacity 8 kJ/kV _____________1 ________________1 ________________1 ________________1 _______________________________1 10 kJ/kV _____________2 ________________2 ________________2 ________________2 _______________________________2 for motors _____________A _________________A _________________A _________________A ________________________________A for generators __________B _________________B _________________B _________________B_________________________________B Special versions for furnace transformers In the case of the 6-arrester circuit or suspended or horizontal mounting, add Z to the Order No. and state the version required in plain text. Rated Short-circuit Weight Housing voltage current strength approx. size 50 kA / 0.2 s Order No. kg 22 3EE2 220 - 2CA0 30 1 30 3EE2 300 - 2CA0 30 1 32 3EE2 320 - 2CA0 30 1 36 3EE2 360 - 2CA0 40 2 45 3EE2 450 - 2CA0 40 2 52 3EE2 520 - 2CA0 40 2 For Order No. kVrms Example for ordering 1) 3EE2 360 - 2CA0 - Z 3EE2 450 - 2CA0 - Z Z: 6-arrester circuit 2) 3EE2 ... - .... - Z Z: suspended / horizontal mounting Accessories Weight housing approx. size kg To be ordered Bolt-type terminal separately: 30 mm dia. 1 and 2 2) 3EX6 006 4 complete with all nuts and bolts 2) Flat-type terminal 1 and 2 3EX6 034 4 complete with 3 3EX7 008 4 all nuts and bolts 1) Only available with 8 kJ/kV MO resistors. 2) Not for 3EE2...-..E1 4 Siemens HG 21.2.7 ⋅ October 1998 Included with 1 set of M 16 insulated fixing bolts, the surge insulating parts for mounting arrester: M 12 earth connection screw n Dimensions Type Hous- Dimension ing H size 3EE2 056-..A0, -..B0, -..C0, -..D0 1 500 2 680 to 3EE2 270-..A0, -..B0, -..C0, -..D0 3EE2 300-..A0, -..B0, -..C0, -..D0 to 3EE2 450-..A0, -..B0, -..C0, -..D0 *) = 5 mm for short-circuit current strengths of 100 kA and 200 kA 3EE2 120-..E1 to 3EE2 450-..E1 housing size 3 with flat-type terminal 3EX7 008 Plan view Section AB Plan view Section AB Plan view Section AB 675 Type Hous- Dimension ing H size 3EE2 220 - 2C.0 1 500 2 680 to 3EE2 320 - 2C.0 3EE2 360 - 2C.0 to 3EE2 520 - 2C.0 Bolt-type terminal 3EX6 006 for housing sizes 1 to 2 Flat-type terminal 3EX6 034 for housing sizes 1 to 2 Ü ÜÜ thick Plan view n Plan view Circuit diagram 6-arrester circuit (with 3EX6 040 tell-tale spark gaps) 1 Not included in the delivery 2 Cu bars for delta connection (included in the delivery) Siemens HG 21.2.7 ⋅ October 1998 5 Conditions of Sale and Delivery Conditions of Sale and Delivery Subject to the General Conditions of Supply and Delivery for Products and Services of the Electrical and Electronic Industry and to any other conditions agreed upon with the recipients of catalogs. n The technical data, dimensions and weights are subject to change unless otherwise stated on the individual pages of this catalog. The illustrations are for reference only. Export Regulations In accordance with the present provisions of the German Export List and the US Commercial Control List, export licences are not required for the products listed in this catalog. An export licence may however be required due to country-specific application and final destination of the products. Relevant are the export criteria stated in the delivery note and in the invoice regarding a possible export and reexport licence. Subject to change without notice. We reserve the right to adjust the prices and shall charge the price applying on the date of delivery. Dimensions Trademarks All dimensions in this catalog are given in mm. All product designations used are trademarks or product names of Siemens AG or of other suppliers. Bereich Energieübertragung und -verteilung Geschäftsgebiet Mittelspannung Postfach 3220 91050 Erlangen http://www.ev.siemens.de Siemens Aktiengesellschaft © Siemens AG 1998 Order No.: E50001-K1521-A271-A3-7600 Printed in Germany KGK 0998 3.0 6 En 100636 6101/U774